Equations (9) and (10) define the consumer price index and the producer
price index for domestically marketed output. The CPI is fixed and
functions as the numéraire in the basic model version; alternatively, the
DPI may be fixed. A numéraire is required since the model is homogeneous
of degree zero in prices—a doubling of the value of the numéraire
would double all prices but leave all real quantities unchanged. All simulated
price and income changes should be interpreted as changes vis-à-vis
the numéraire price index.
这个文献里的不知道啥语言的numéraire是啥意思，用英语翻译不出来，是个专有名词吗？求教各位大神。